> ## Documentation Index
> Fetch the complete documentation index at: https://dso.getlemma.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Provider taxonomy codes

> What taxonomy is, the dentist taxonomy family and group codes, how taxonomy is chosen at NPI registration, and the enrollment-mismatch failure mode that denies dental claims.

A **taxonomy code** is a 10-character alphanumeric code that identifies a healthcare provider's type, classification, and area of specialization. It is selected during NPI registration and may appear on claims. A mismatch between the claim and the payer's enrollment record can cause an administrative denial even when the clinical information is correct.

The **National Uniform Claim Committee (NUCC)** maintains the code set and updates it twice a year.<sup>1</sup>

## The structure

Ten characters, hierarchical:

| Position | Meaning                |
| -------- | ---------------------- |
| 1–2      | Provider grouping      |
| 3–6      | Classification         |
| 7–9      | Area of specialization |
| 10       | Always `X`             |

Example: `1223G0001X`; the `12` grouping covers dental providers, `23` classifies dentists, and `G0001` designates general practice.

## Avoid taxonomy mismatches

**The taxonomy on the claim should match the payer's enrollment record.**

A mismatch may produce **CARC 8** (procedure inconsistent with the provider type), **CARC 170**, or another payer-specific enrollment edit. Check the submitted taxonomy and the payer's enrollment record before changing clinical coding.

Check two distinct taxonomy records:

* **Group taxonomy** on the PC's **Type 2** NPI, appearing in the 837D's `PRV` segment for the billing provider
* **Individual taxonomy** on each dentist's **Type 1** NPI

Verify both against the payer's records before go-live and whenever the group adds a specialty, location, or acquired practice.

## The dentist taxonomy family

Dentists sit in the `122300000X` family, with more specific codes for recognized specialties. The following examples are useful for orientation, but confirm the current code in the NUCC set before registering:

| Code         | Type                                              |
| ------------ | ------------------------------------------------- |
| `122300000X` | Dentist (the general family code)                 |
| `1223G0001X` | Dentist, General Practice                         |
| `1223P0221X` | Dentist, Pediatric Dentistry                      |
| `1223X0400X` | Dentist, Orthodontics and Dentofacial Orthopedics |
| `1223S0112X` | Dentist, Oral and Maxillofacial Surgery           |
| `1223E0200X` | Dentist, Endodontics                              |
| `1223P0300X` | Dentist, Periodontics                             |

The NUCC set carries additional dental specialty codes (prosthodontics, oral pathology, public health, and others) and codes for other dental team members, including dental hygienists. Consult the [NUCC code set](https://www.nucc.org/index.php/code-sets-mainmenu-41/provider-taxonomy-mainmenu-40) for the full family rather than relying on any static table.

**Choosing a code:** a general dentist generally uses the general-practice code, while a specialist uses the code matching the specialty under which the payer will credential the dentist. DHMO and Medicaid networks may enroll specialists separately and apply different claim edits or fee schedules.

## Group taxonomies

The PC's Type 2 NPI needs its own taxonomy:

| Code         | Type                      |
| ------------ | ------------------------- |
| `193200000X` | **Multi-Specialty Group** |
| `193400000X` | Single Specialty Group    |

<Tip>
  For a **PC's Type 2 NPI**, `193400000X` may fit a single-specialty practice, including a general-dentistry group, while `193200000X` may fit a group that spans multiple specialties. Confirm the choice against the current NUCC definitions and payer enrollment instructions. Do not select a clinic or center code merely because the practice has several locations; some codes describe a facility type that may have separate licensing implications.
</Tip>

## Why taxonomy matters in dental enrollment

Taxonomy appears throughout the [payer-enrollment pipeline](/guides/enrollment/enroll-with-dental-payers), and an inconsistency may not surface until claims are submitted:

* **NPPES** holds the registered taxonomy for each NPI; the record payers check first.
* **Credentialing applications** ask for specialty; the answer must map to the registered taxonomy.
* **Participation agreements** enroll the group and each dentist under specific taxonomies; the payer's claim edits enforce them.
* **Medicaid dental programs and their benefit administrators** (DentaQuest, MCNA, Liberty) credential by provider type; a pediatric-dentistry taxonomy can carry different fee schedules and preauthorization rules than general practice.
* **Multi-PC groups have more records to reconcile.** Each PC's Type 2 NPI has its own group taxonomy, and each dentist working across PCs must be linked to the relevant contracts under the appropriate individual taxonomy.

## Choosing at NPI registration

<Steps>
  <Step title="Individual (Type 1)">
    The dentist's specialty. A boarded specialist uses the specialty code if payers in your market credential it; a general dentist uses general practice.
  </Step>

  <Step title="Group (Type 2)">
    The practice's specialty mix; single-specialty or multi-specialty. Match it to what you will enroll and contract with.
  </Step>

  <Step title="Multiple taxonomies">
    NPPES permits more than one per NPI, with one designated **primary**. The primary is what most payers use. A dentist who practices both general dentistry and a specialty may carry both. Record which taxonomy each payer enrolled.
  </Step>

  <Step title="Record both, everywhere">
    In your enrollment grid, alongside the NPI and Tax ID. This is the record you check when a CARC 8 arrives.
  </Step>
</Steps>

## When to change one

Update the taxonomy in NPPES when:

* A dentist completes residency and changes from general practice to a specialty
* The group's specialty mix changes materially; you add an ortho or oral-surgery service line
* A payer tells you the enrolled taxonomy doesn't match your services

**Changing a taxonomy in NPPES does not update payer enrollment records.** After changing it, notify each payer and Medicaid dental benefit administrator, then confirm the update. A mismatch between NPPES and the payer's record can cause claim denials.

## Sources

1. National Uniform Claim Committee, [Health Care Provider Taxonomy Code Set](https://www.nucc.org/index.php/code-sets-mainmenu-41/provider-taxonomy-mainmenu-40). Updated twice annually. Verify current codes before registration.